Safety protection circuit and device for measuring resistance value of relay contact

Abstract

The utility model provides a safety protection circuit and device for measuring the resistance value of a relay contact, which relates to the technical field of auxiliary detection of electrical equipment and comprises a power supply module, a resistance value measuring module, a switch module and a base module, the base module comprises a power interface, a common end interface, a plurality of normally closed end interfaces and a plurality of normally open end interfaces; the power module is connected with the power interface and the resistance measurement module. The first input end of the resistance value measuring module is connected with the common end interface, the second input end of the resistance value measuring module is connected with the output end of the switch module, the switch module is provided with a plurality of input ends, and each input end of the switch module is connected with a non-repeated normally closed end interface or a non-repeated normally open end interface. And the output end of the switch module is configured to be conducted with the input end of any one switch module. According to the utility model, the problems in the prior art that the measurement of the resistance values of the normally-closed point and the normally-open point of each channel of the relay is troublesome and the efficiency is low are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary detection of electrical equipment, in particular to a safety protection circuit and a device for measuring the resistance of relay contacts. Background Art

[0002] Relays are commonly used in automatic control circuits, providing automatic regulation, safety protection, and circuit switching. Wind turbines may encounter various faults during operation, such as overvoltage, undervoltage, current overload, and overtemperature. If these faults are not promptly addressed, they can cause serious damage to the equipment, even leading to serious consequences such as burnout or explosion. Relays protect equipment by controlling the on / off switching of circuits, effectively disconnecting or opening them. Due to their mechanical characteristics, relays generally have a stable service life of 3-5 years. However, as the contacts discharge, oxidize, and other factors, the resistance between the contacts gradually increases, leading to false operation or failure to operate, affecting the stable operation of the entire system. Therefore, regularly measuring the resistance between the relay contacts can help identify abnormal relay operation in advance.

[0003] The conventional method for testing relays is to remove the relay head, use a multimeter to measure the normally closed resistance, manually trigger the relay, measure the normally open resistance, and then repeat the measurement on the next channel. When a large number of relays need to be tested, the above steps need to be repeated many times, which is more troublesome and inefficient. Utility Model Content

[0004] In response to the deficiencies in the prior art, the utility model provides a safety protection circuit and device for measuring the resistance of relay contacts, which solves the problem in the prior art that measuring the resistance of the normally closed and normally open points of each channel of the relay is troublesome and inefficient.

[0005] At least one embodiment of the present utility model provides a safety protection circuit for measuring relay contact resistance, comprising:

[0006] A power module, a resistance measurement module, a switch module, and a base module, wherein the base module includes a power interface, a common terminal interface, multiple normally closed terminal interfaces, and multiple normally open terminal interfaces;

[0007] The power supply module is connected to the power supply interface and the resistance measurement module at the same time;

[0008] The first input end of the resistance measurement module is connected to the common end interface, and the second input end of the resistance measurement module is connected to the output end of the switch module. The switch module has multiple input ends, and each input end of the switch module is connected to a non-repeated normally closed end interface or a normally open end interface. The output end of the switch module is configured to be conductive with any one of the input ends of the switch module.

[0009] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0010] When in use, connect the relay to be tested to the above-mentioned base module, connect the power interface of the base module to the power terminal of the relay, connect the common terminal interface of the base module to the common terminal of the relay, connect the normally closed terminal interfaces of the base module to the normally closed contacts of the relay, and connect the normally open terminal interfaces of the base module to the normally open contacts of the relay;

[0011] At this time, by sequentially changing the conduction between the input end and one of the output ends of the switch module, the resistance measurement module can be used to measure the resistance of each normally closed contact and normally open contact of the relay to be measured one by one. That is, the utility model only needs to adjust the conduction between the input end and each output end in the switch module to realize the resistance measurement of the normally closed contact and normally open contact of each channel of the relay, which is more convenient and quicker than the existing technology.

[0012] In one embodiment of the present utility model, the circuit further includes an AC-DC power conversion module;

[0013] The base modules are an AC relay base module and a DC relay base module, the common end interface of the AC relay base module and the common end interface of the DC relay base module are both connected to the first input end of the resistance measurement module, and the AC relay base module and the DC relay base module each have a plurality of normally closed end interfaces and a plurality of normally open end interfaces;

[0014] The power supply module is connected to the power supply interface of the AC relay base module, and the power supply module is connected to the power supply interface of the DC relay base module through the AC-DC power conversion module.

[0015] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0016] By utilizing the AC relay base module and the DC relay base module, the circuit can be used to detect the AC relay and the DC relay simultaneously or separately, thereby increasing the application range of the circuit.

[0017] In one embodiment of the present invention, the power interface of the DC relay base module is further connected to a DC power supply via a power switch.

[0018] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0019] By using a DC power supply to power the DC relay base module, resistance measurement can still be performed on each channel of the DC relay when the power module fails or the AC-DC power conversion module fails.

[0020] In one embodiment of the present utility model, the circuit further comprises a first circuit switch, a second circuit switch, and a third circuit switch, wherein the first circuit switch is connected to the power module to control the connection between the power module and the power interface of the AC relay base module, the resistance measurement module, and the AC-DC power conversion module;

[0021] The second circuit switch is connected to the power interface of the AC relay base module to control the connection between the first circuit switch and the power interface of the AC relay base module;

[0022] The third circuit switch is connected to the power interface of the DC relay base module to control the connection between the power interface of the DC relay base module, the AC-DC power conversion module and the DC power supply.

[0023] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0024] The first circuit switch, the second circuit switch, and the third circuit switch can respectively control the power supply of the circuit to the entire circuit, the power supply to the AC relay base module, and the power supply to the DC relay base module. When one of the base modules is not in use, the power supply to the corresponding base module is cut off immediately to avoid power waste.

[0025] In one embodiment of the present utility model, the circuit further includes a first voltage detection module and a second voltage detection module, the first voltage detection module is connected to the power module, and the second voltage detection module is connected to the DC output end of the AC-DC power conversion module.

[0026] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0027] According to the detection results of the first voltage detection module and the voltage detection module, the normal state of the power output of the circuit can be judged more intuitively.

[0028] In one embodiment of the present invention, the circuit further includes a first switch, a second switch, and a Kelvin clamp, wherein the first switch and the second switch each have a first end, a second end, and a third end, and the first end is configured to be connected to the second end or the third end;

[0029] A first end of the first switch is connected to the first input end of the resistance measurement module, a second end of the first switch is connected to the common end interface, a first end of the second switch is connected to the second input end of the resistance measurement module, a second end of the second switch is connected to the input end of the switch module, and third ends of the first switch and the second switch are both connected to the Kelvin clamp.

[0030] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0031] By using the Kelvin clip, the first switch, and the second switch, this circuit can be used to measure the internal resistance of the lead-acid battery when the resistance of the relay is not being measured. This expands the application scenarios of this circuit.

[0032] In one embodiment of the present invention, the power supply module is connected to the resistance measurement module via a charging module.

[0033] In one embodiment of the present invention, the AC relay base module includes a three-way AC relay base module and a four-way AC relay base module, wherein:

[0034] The three-way AC relay base module has three normally closed end interfaces and three normally open end interfaces, and the four-way AC relay base module has four normally closed end interfaces and four normally open end interfaces;

[0035] The power interfaces of the three-way AC relay base module and the four-way AC relay base module are simultaneously connected to the power module, and the first input end of the resistance measurement module is simultaneously connected to the common end interface of the three-way AC relay base module and the four-way AC relay base module.

[0036] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0037] Through the three-way AC relay base module and the four-way AC relay base module, this circuit can be adapted to more models of AC relays.

[0038] In one embodiment of the present invention, the DC relay base module includes a three-way DC relay base module and a four-way DC relay base module, wherein:

[0039] The three-way DC relay base module has three normally closed end interfaces and three normally open end interfaces, and the four-way DC relay base module has four normally closed end interfaces and four normally open end interfaces;

[0040] The power supply module is connected to the power supply interfaces of the three-way DC relay base module and the four-way DC relay base module through the AC-DC power conversion module, and the first input end of the resistance measurement module is connected to the common end interface of the three-way DC relay base module and the four-way DC relay base module.

[0041] The technical solution disclosed by the utility model has at least the following beneficial effects:

[0042] Through the three-way DC relay base module and the four-way DC relay base module, this circuit can be adapted to more types of DC relays.

[0043] The utility model also provides a safety protection device for measuring the resistance of relay contacts, comprising the safety protection circuit for measuring the resistance of relay contacts as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural diagram of the utility model;

[0045] Figure 2 This is a specific circuit diagram of the present utility model.

[0046] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0047] 1. Power module, 2. First circuit switch, 3. First voltage detection module, 4. AC-DC power conversion module, 5. Resistance measurement module, 6. DC fuse, 7. Second voltage detection module, 8. DC power module, 9. Third circuit switch, 10. Transfer switch, 11. Kelvin clamp, 12. Switch module, 13. Charging module, 14. Second circuit switch, 15. Three-way AC relay base module, 16. Four-way AC relay base module, 17. Three-way DC relay base module, 18. Four-way DC relay base module. DETAILED DESCRIPTION

[0048] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0049] Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without mutual contradiction.

[0050] This utility model provides a safety protection circuit for measuring the resistance of relay contacts. Figure 1 As shown, including:

[0051] A power supply module 1, a resistance measurement module 5, a switch module 12, and a base module. The base module includes a power interface, a common terminal interface, multiple normally closed terminal interfaces, and multiple normally open terminal interfaces. The specific model of the resistance measurement module 5 used in this embodiment is the RC3562 internal resistance tester.

[0052] The power supply module 1 is connected to the power supply interface and the resistance measurement module 5 at the same time;

[0053] The first input end of the resistance measuring module 5 is connected to the common end interface, and the second input end of the resistance measuring module 5 is connected to the output end of the switch module 12. The switch module 12 has multiple input ends, and each input end of the switch module 12 is connected to a non-repeated normally closed end interface or a normally open end interface. The output end of the switch module 12 is configured to be conductive with any one of the input ends of the switch module 12.

[0054] The switch module 12 can be implemented in various ways, for example, by using a plurality of push button switches or knife switches having only on / off functions, wherein one end of each of the switches is connected to serve as the output end of the switch module 12, and the remaining ends serve as the input ends of the switch module 12;

[0055] For more convenient operation, the switch module 12 in this embodiment is one or more knob switches, the number of which can be determined according to the number of input terminals of the switch module 12. When there are multiple knob switches, it is only necessary to connect the output terminals of the multiple knob switches as one output terminal. In this embodiment, the number of input terminals of one knob switch can correspond to the input terminals of all base modules for schematic description;

[0056] By rotating the knob switch, its output end can always be connected to only one input end, which facilitates the detection of subsequent switching relay channels. The specific structure of the knob switch is prior art and will not be described in detail here.

[0057] When in use, connect the relay to be tested to the above-mentioned base module, connect the power interface of the base module to the power terminal of the relay, connect the common terminal interface of the base module to the common terminal of the relay, connect the normally closed terminal interfaces of the base module to the normally closed contacts of the relay, and connect the normally open terminal interfaces of the base module to the normally open contacts of the relay;

[0058] At this time, by turning the knob switch in sequence to connect its input end with one of the output ends, the resistance measurement module 5 can be used to measure the resistance of each normally closed contact and normally open contact of the relay to be measured one by one. That is, the utility model only needs to turn the knob switch to change the conduction between its input end and each output end to achieve the resistance measurement of the normally closed contact and normally open contact of each channel of the relay, which is more convenient and quicker than the existing technology.

[0059] Specifically, combined Figure 2 right Figure 1 The scheme in the embodiment is specifically described, and the present circuit further comprises an AC-DC power conversion module 4;

[0060] The base module is divided into an AC relay base module and a DC relay base module. The common end interface of the AC relay base module and the DC relay base module both have the above-mentioned power interface, common end interface, multiple normally closed end interfaces and multiple normally open end interfaces, and the connection of each interface is the same as the connection of each interface of the above-mentioned base module;

[0061] by Figure 2 Taking the three-way AC relay base module 15 located on the far left as an example, the three contacts on the left are three normally closed end interfaces, which are used to connect to the three normally closed contacts of the three-way AC relay; the three contacts on the upper side are three normally open end interfaces, which are used to connect to the three normally open contacts of the three-way AC relay; the three contacts on the middle right side are common end interfaces, which are used to connect to the three common contacts of the three-way AC relay; the two end contacts on the lower right side are power interfaces, which are used to connect to the power port of the three-way AC relay;

[0062] Specifically, the common end interfaces of the AC relay base module and the DC relay base module are both connected to the first input end of the resistance measurement module 5, and the AC relay base module and the DC relay base module both have multiple normally closed end interfaces and multiple normally open end interfaces;

[0063] The power module 1 is connected to the power interface of the AC relay base module, and the power module 1 is connected to the power interface of the DC relay base module through the AC-DC power conversion module 4.

[0064] By utilizing the AC relay base module and the DC relay base module, the circuit can be used to detect the AC relay and the DC relay simultaneously or separately, thereby increasing the application range of the circuit.

[0065] The power supply module 1 is actually connected to the resistance measurement module 5 via the charging module 13;

[0066] Specifically, the circuit further includes a DC power supply module 8, which has a DC power supply and a power switch. The power interface of the DC relay base module is connected to the DC power supply via the power switch.

[0067] By using a DC power supply to power the DC relay base module, resistance measurement can still be performed on each channel of the DC relay when the power module 1 fails or the AC-DC power conversion module 4 fails.

[0068] Specifically, the circuit further includes a first circuit switch 2, a second circuit switch 14, and a third circuit switch 9. The first circuit switch 2 is connected to the power module 1 to control the connection between the power module 1 and the power interface of the AC relay base module, the resistance measurement module 5, and the AC-DC power conversion module 4.

[0069] The second circuit switch 14 is connected to the power interface of the AC relay base module to control the connection between the first circuit switch 2 and the power interface of the AC relay base module;

[0070] The power interface of the DC relay base module is connected to the third line switch 9 through the DC fuse 6 to control the connection between the power interface of the DC relay base module and the AC-DC power conversion module 4 and the DC power supply.

[0071] The first circuit switch 2, the second circuit switch 14, and the third circuit switch 9 can respectively control the power supply to the entire circuit, the power supply to the AC relay base module, and the power supply to the DC relay base module. When one base module is not in use, the power supply to the corresponding base module is immediately cut off, thereby avoiding power waste.

[0072] Specifically, the circuit further includes a first voltage detection module 3 and a second voltage detection module 7 , wherein the first voltage detection module 3 is connected to the power module 1 , and the second voltage detection module 7 is connected to the DC output end of the AC-DC power conversion module 4 .

[0073] According to the detection results of the first voltage detection module 3 and the voltage detection module, the normal state of the power output of the circuit can be judged more intuitively.

[0074] Specifically, the circuit further includes a switch 10 and a Kelvin clamp 11, wherein the switch 10 includes a first switch and a second switch. In the switch 10, the two switches at the lower end are the first switches, and in the switch 10, the two switches at the upper end are the second switches.

[0075] The first switch and the second switch each have a first end, a second end, and a third end, the first end being configured to be connected to the second end or the third end, and in the first switch and the second switch, the first end is an end point located on the left side of the switch, the second end is an end point located on the lower right side of the switch, and the third end is an end point located on the upper right side of the switch;

[0076] The first end of the first switch is connected to the first input end of the resistance measurement module 5, the second end of the first switch is connected to the common end interface, the first end of the second switch is connected to the second input end of the resistance measurement module 5, the second end of the second switch is connected to the input end of the switch module 12, and the third ends of the first switch and the second switch are both connected to the Kelvin clamp 11.

[0077] It should be understood that the first switch and the second switch may be implemented by a switch with more channels, or by four single switches with only an opening and closing function, which is not limited here;

[0078] During normal use, the first ends of the first and second switches are switched to be connected to the second ends. At this time, the resistance measurement module 5 can be connected to one of the normally closed end interfaces or the normally open end interfaces in the base module and the common end interface through the switch module 12 (knob switch), thereby measuring the resistance of the corresponding channel in the relay.

[0079] When this circuit is not used to measure the resistance of the relay, the first end of the first switch and the second switch can be connected to the third end to disconnect the connection between the resistance measurement module 5 and the switch module 12, and the resistance measurement module 5 can be connected to the Kelvin clamp 11 to measure the internal resistance of the lead-acid battery using the Kelvin clamp 11 and the resistance measurement module 5, thereby expanding the application scenarios of this circuit.

[0080] Specifically, the AC relay base module includes a three-way AC relay base module 15 and a four-way AC relay base module 16. The three-way AC relay base module 15 has three normally closed end interfaces and three normally open end interfaces, and the four-way AC relay base module 16 has four normally closed end interfaces and four normally open end interfaces.

[0081] The DC relay base module includes a three-way DC relay base module 17 and a four-way DC relay base module 18. The three-way DC relay base module 17 has three normally closed end interfaces and three normally open end interfaces, and the four-way DC relay base module 18 has four normally closed end interfaces and four normally open end interfaces.

[0082] The power interfaces of the three-way AC relay base module 15 and the four-way AC relay base module 16 are simultaneously connected to the power module 1, and the first input end of the resistance measurement module 5 is simultaneously connected to the common end interface of the three-way AC relay base module 15 and the four-way AC relay base module 16.

[0083] The power supply module 1 is connected to the power supply interfaces of the three-way DC relay base module 17 and the four-way DC relay base module 18 through the AC-DC power conversion module 4, and the first input end of the resistance measurement module 5 is connected to the common end interface of the three-way DC relay base module 17 and the four-way DC relay base module 18.

[0084] Through the three-way DC relay base module 17 and the four-way DC relay base module 18, this circuit can be adapted to more types of DC relays, and through the three-way AC relay base module 15 and the four-way AC relay base module 16, this circuit can be adapted to more types of AC relays.

[0085] The utility model also provides a safety protection device for measuring the resistance of relay contacts, comprising the safety protection circuit for measuring the resistance of relay contacts as described above.

[0086] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A safety protection circuit for measuring relay contact resistance, characterized in that: include: A power module (1), a resistance measurement module (5), a switch module (12), and a base module, wherein the base module includes a power interface, a common end interface, a plurality of normally closed end interfaces, and a plurality of normally open end interfaces; The power supply module (1) is connected to the power supply interface and the resistance measurement module (5) at the same time; The first input end of the resistance measurement module (5) is connected to the common end interface, and the second input end of the resistance measurement module (5) is connected to the output end of the switch module (12). The switch module (12) has multiple input ends, and each input end of the switch module (12) is connected to a non-repeated normally closed end interface or a normally open end interface. The output end of the switch module (12) is configured to be conductive with any input end of the switch module (12).

2. A safety protection circuit for measuring relay contact resistance according to claim 1, characterized in that: The circuit also includes an AC-DC power conversion module (4); The base modules are an AC relay base module and a DC relay base module, the common end interface of the AC relay base module and the common end interface of the DC relay base module are both connected to the first input end of the resistance measurement module (5), and the AC relay base module and the DC relay base module both have a plurality of normally closed end interfaces and a plurality of normally open end interfaces; The power supply module (1) is connected to the power supply interface of the AC relay base module, and the power supply module (1) is connected to the power supply interface of the DC relay base module via the AC-DC power conversion module (4).

3. A safety protection circuit for measuring relay contact resistance according to claim 2, characterized in that: The power interface of the DC relay base module is also connected to a DC power supply through a power switch.

4. A safety protection circuit for measuring relay contact resistance according to claim 3, characterized in that: The circuit further comprises a first circuit switch (2), a second circuit switch (14) and a third circuit switch (9), wherein the first circuit switch (2) is connected to the power module (1) to control the connection between the power module (1) and the power interface of the AC relay base module, the resistance measurement module (5) and the AC-DC power conversion module (4); The second circuit switch (14) is connected to the power interface of the AC relay base module to control the connection between the first circuit switch (2) and the power interface of the AC relay base module; The third line switch (9) is connected to the power interface of the DC relay base module to control the connection between the power interface of the DC relay base module and the AC-DC power conversion module (4) and the DC power supply.

5. A safety protection circuit for measuring relay contact resistance according to claim 3, characterized in that: The circuit further comprises a first voltage detection module (3) and a second voltage detection module (7); the first voltage detection module (3) is connected to the power module (1); and the second voltage detection module (7) is connected to the DC output end of the AC-DC power conversion module (4).

6. A safety protection circuit for measuring relay contact resistance according to claim 1, characterized in that: The circuit further comprises a first switch, a second switch and a Kelvin clamp (11), wherein the first switch and the second switch each have a first end, a second end and a third end, and the first end is configured to be connected to the second end or the third end; The first end of the first switch is connected to the first input end of the resistance measurement module (5), the second end of the first switch is connected to the common end interface, the first end of the second switch is connected to the second input end of the resistance measurement module (5), the second end of the second switch is connected to the input end of the switch module (12), and the third ends of the first switch and the second switch are both connected to the Kelvin clamp (11).

7. A safety protection circuit for relay contact resistance measurement according to claim 1, characterized in that: The power supply module (1) is connected to the resistance measurement module (5) via a charging module (13).

8. A safety protection circuit for measuring relay contact resistance according to claim 2, characterized in that: The AC relay base module comprises a three-way AC relay base module (15) and a four-way AC relay base module (16), wherein: The three-way AC relay base module (15) has three normally closed end interfaces and three normally open end interfaces, and the four-way AC relay base module (16) has four normally closed end interfaces and four normally open end interfaces; The power supply interfaces of the three-way AC relay base module (15) and the four-way AC relay base module (16) are simultaneously connected to the power supply module (1), and the first input end of the resistance measurement module (5) is simultaneously connected to the common end interface of the three-way AC relay base module (15) and the four-way AC relay base module (16).

9. A safety protection circuit for measuring relay contact resistance according to claim 2, characterized in that: The DC relay base module comprises a three-way DC relay base module (17) and a four-way DC relay base module (18), wherein: The three-way DC relay base module (17) has three normally closed end interfaces and three normally open end interfaces, and the four-way DC relay base module (18) has four normally closed end interfaces and four normally open end interfaces; The power supply module (1) is simultaneously connected to the power supply interfaces of the three-way DC relay base module (17) and the four-way DC relay base module (18) via the AC-DC power conversion module (4), and the first input end of the resistance measurement module (5) is simultaneously connected to the common end interface of the three-way DC relay base module (17) and the four-way DC relay base module (18).

10. A safety protection device for measuring the resistance of relay contacts, characterized in that: The invention comprises a safety protection circuit for measuring the resistance of relay contacts according to any one of claims 1 to 9.

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